Using SVD to Recommend Movies
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1 Michael Percy University of California, Santa Cruz Last update: December 12, 2009 Last update: December 12, /
2 Outline 1 Introduction 2 Singular Value Decomposition 3 Experiments 4 Conclusion Last update: December 12, /
3 Collaborative Filtering Introduction Goal: Predict the preferences of a user based on data taken from similar users Last update: December 12, /
4 Introduction Collaborative Filtering (cont.) Idea: Distill the essence of the data into features that can be used for prediction The Singular Value Decomposition (SVD) can be used to factor the matrix to give an approximation of the missing values Last update: December 12, /
5 Introduction The Netflix Competition The Netflix competition pitted teams from across the world to find ways to predict movies better for users The Netflix data set includes: Integral ratings from 1 to 5 for 17,000 movies From 480,000 users Totalling over 100 million ratings Essentially a sparse matrix Total entries: roughly 8.5 billion. Matrix is close to 99% empty! Last update: December 12, /
6 Singular Value Decomposition Singular Value Decomposition (SVD) Idea: Compress each dimension of the matrix (users movies) to approximate the known values. Each dimension is then represented by a finite number of features which are combined to estimate the missing values. Last update: December 12, /
7 Singular Value Decomposition SVD Definition The SVD is a factorization of a matrix such that: Where: M is the ratings matrix M = UΣV T Σ is a diagonal matrix of singular values and U and V are the eigenvectors of MM T and M T M, respectively. Intuitively, the singular values in Σ are weighting factors for U and V. The singular values are the square roots of the eigenvalues of MM T corresponding to the eigenvectors in U and V. Last update: December 12, /
8 Singular Value Decomposition Using SVD for Matrix Approximation If approximation or compression is desired, a lower-rank SVD M can be computed from M: Rank r is chosen and only the r singular values of greatest magnitude are used. Thus the rank of U and V are reduced as well U, Σ, and V are reduced to dimension m r, r r, and r n respectively. This approximation minimizes the Frobenius norm of A = M M: min{m, n} A F = m n σi 2 = a ij 2 i=1 i=1 j=1 Last update: December 12, /
9 Singular Value Decomposition Incremental SVD An incremental algorithm for SVD was developed by Simon Funk based on a paper by Genevieve Gorrell, in which the SVD is approximated numerically via gradient descent An approximation rank r is chosen beforehand such that there are r feature vectors for movies and users The Σ matrix is left blended into the feature vectors, so only U and V remain Initial values for these feature vectors are set arbitrarily, i.e. 0.1 Gradient descent is used to minimize the function for each feature vector along users and movies Last update: December 12, /
10 Singular Value Decomposition Incremental SVD (cont.) Based on the gradients, the incremental SVD update function for Gradient Descent is: err = η (M ij M ) ij userval = U if U if = U if + err(v fj ) V fj = V fj + err(userval) For learning rate η, user i, movie j, and feature f {1, r}. Last update: December 12, /
11 Experiments Experiments The data set was reduced so that experimentation and testing was feasible. The set was reduced randomly to: 2,000 movies 1,000,000 users 3,867,371 total ratings And the data was further split into an 80% training set and a 20% validation set. Last update: December 12, /
12 Learning Rate Experiments Several learning rates were tested, for η = 0.1, 0.01, and Last update: December 12, /
13 Experiments Number of features with no regularization The rank r, or number of features chosen, was first tested without regularization. The learning rate eta = was used based on the above experiments. Last update: December 12, /
14 Experiments Number of features with regularization Regularization proved to be key in being able to use more features without overfitting. This is a graph of the validation set RMSE: Last update: December 12, /
15 Experiments Number of features with regularization cont. And the training set RMSE: Last update: December 12, /
16 Conclusion Conclusion In conclusion, the incremental SVD seems to do a pretty good job of approximating the missing values in the matrix and predicting expected ratings. Learning rate seemed to perform the best out of the learning rates tested The ideal number of features for this data set is around 70, with regularization parameter Out of the values for regularization tested, the most effective regularization coefficient value was on 90 features, getting a validation RMSE of Last update: December 12, 2009 /
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